import re

from django_redis import get_redis_connection
from rest_framework import serializers
from rest_framework_jwt.settings import api_settings

from celery_tasks.email.tasks import send_verify_mail
from users.models import User, Address


class RegisterCreateSerializer(serializers.ModelSerializer):

    password2 = serializers.CharField(label='校验密码',allow_null=False,allow_blank=False,write_only=True)

    sms_code = serializers.CharField(label='短信验证码',max_length=6,min_length=6,allow_null=False,allow_blank=False,write_only=True)

    allow = serializers.CharField(label='是否同意协议',allow_null=False,allow_blank=False,write_only=True)

    token = serializers.CharField(label='登录状态',read_only=True)

    class Meta:

        model = User

        fields = ('id','username','password','password2','sms_code','allow','mobile','token')

        extra_kwargs = {
            'id':{'read_only':True},
            'username':{
                'min_length':5,
                'max_length':20,
                'error_messages':{
                    'min_length':'仅允许５－２０个字符的用户名',
                    'max_length':'仅允许５－２０个字符的用户名',
                }
            },
            'password':{
                'write_only':True,
                'min_length':8,
                'max_length':20,
                'error_messages':{
                    'min_length':'仅允许８－２０个字符的密码',
                    'max_length':'仅允许８－２０个字符的密码',
                }
            }
        }

        def validate_mobile(self,value):
            if not re.match(r'1[345789]\d{9}',value):
                raise serializers.ValidationError('手机号格式不正确')
            return value

        def validate_allow(self,value):

            if value != 'true':
                raise serializers.ValidationError('您未同意协议')
            return value

        def validate(self,attrs):

            password = attrs['password']
            password2 = attrs['password2']

            if password != password2:

                raise serializers.ValidationError('密码不一致')

            code = attrs['sms_code']

            redis_conn = get_redis_connection('code')

            mobile = attrs['mobile']

            redis_code = redis_conn.get('sms_%s'%mobile)
            if redis_code is None:
                raise serializers.ValidationError('验证码已过期')

            if redis_code.decode() != code:
                raise serializers.ValidationError('验证码不正确')


            return attrs

    def create(self,validated_data):

        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']

        user = super().create(validated_data)

        user.set_password(validated_data['password'])
        user.save()

        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)

        user.token = token

        return user

class UserDetailSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ('id', 'username', 'mobile', 'email', 'email_active')

class EmailSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ('id','email')

        extra_kwargs = {
            'email':{
                'required':True
            }
        }
    def update(self, instance, validated_data):

        email = validated_data['email']
        instance.email = validated_data['email']
        instance.save()
        verify_url = instance.generate_verify_email_url()
        send_verify_mail.delay(email,verify_url)
        return instance

class AddressSerializer(serializers.ModelSerializer):

    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID',required=True)
    city_id = serializers.IntegerField(label='市ID',required=True)
    district_id = serializers.IntegerField(label='区ID',required=True)
    mobile = serializers.RegexField(label='手机号',regex=r'^1[3-9]\d{9}$')


    class Meta:
        model = Address
        exclude = ('user','is_deleted','create_time','update_time')

    def create(self,validated_data):
        validated_data['user'] = self.context['request'].user
        return super().create(validated_data)



